Joule Thief

[jeanna]

So when i am adding turns. I am adding bifilar turns? so instead of 6 it would be 7, and so on..

I can only fit 6 turns with the 22 ga.. Ill have to use that crappy 30 ga mag wire. I hate that stuff.. its so brittle.

No
You are adding turns to the secondary and they are single.

The bifilar 6T,6T  which is called the primary makes the oscillation happen.
The resistor at the base of the transistor controls the speed of the oscillation
The number of turns on the bifilar also effect the speed of oscillation because of many factors.
When that basic joule thief is already all set and the light works etc. You remove the light from the basic joule thief place and wind some single turns around the toroid in addition to the 6T,6T bifilar.
This is the secondary , also called the pickup, and it can be made with thin wire.

This secondary is somewhat independent of the joule thief circuit.
It does not actually connect to anything in the bjt circuit but it is turned on by induction created by what is happening in the bjt circuit.
It benefits from the oscillation of the bjt and has a corresponding oscillation which has enough stuff to turn on the leds.

I know you know a lot of this. I just thought I would go over it all just to put it together.

[Mk1]

I believe this is not true.
I have gone as high as 50Kohm and xee2 has gone to 500kohm. As the value of the base resistor goes up and now we see the frequency goes up too, the voltage goes down.
It does change.I am talking about higher than 1K and maybe you do need a scope to see this.I don't follow what you are saying here.

Really test it ! On my toroid it happen at with 8 turns , Ist found that at 5 turn , and told everyone about it . Actually he said that his was not freq dependent , i believe its the right wording.

The rules you are trying to make , don't work on any number of turns, but do test!

This is nothing against your work, but there is a bit more to it !

So for the scientific mind , these facts are important ! Testing for the sweet spot , would have showed you that , at one point you not have been able to find a spot better then the other .

Mark

Edit , i show people how to do it because every time someone has something worth attention , you get 200 pages of people arguing about how its impossible , and no one making it , or trying before someone get the same results
since not everyone is able to make things right , you only need one person to say it doesn't work , and then your done and wasted your time.

So i am not about to burn steps.

[TheNOP]

the greater the frequency, the greater the capacitive coupling is.
the greater the frequency, the smaller the capacitor value need to be for coupling(displace the currents)

that is why leds and neons can be light with just 1 connected wire at relatively high frequencies.
as long as the potential difference between the 2 ends is high enough, you don't even need wires to light them.
and it does not only apply to lights.

the greater the frequency, the greater the inductive coupling is.
the greater the frequency, the more currents is transferred inductively.
and the greater the frequency, the less the turns ratio of a transfo is meaningfull.


in electronic those are often called "parasitic coupling" because they are unwanted effect in most applications.
radio, computer, tv and a lots more.
in fact, in almost all appliances that deal with high frequencies.
this is why computer cables, such as IDE/SCSI cables, have a ground wire between each signal wire.


between 60Hz AC, 400Hz AC and DC, DC pack more energy.
high frequency, AC or pulsed DC, pack less energy then DC, but more then low frequencies AC/pulsed DC.
this, and inductive coupling, is why 450Hz is used in special inverter. ex: airplane applications
ever wondered why caps rated for 100 volts AC will blow up fairly fast if connected to a 100 volts DC source ?

[Pirate88179]

Hey, before going to bed here, I just volt tested the earth battery and it is now up to 2.0 vdc.  I noticed this in my tests last year with the smaller set-up.  The longer it is in the ground and the more you use it, the volts will climb up a little bit from where you started.

Bill

[WilbyInebriated]

Hey, before going to bed here, I just volt tested the earth battery and it is now up to 2.0 vdc.  I noticed this in my tests last year with the smaller set-up.  The longer it is in the ground and the more you use it, the volts will climb up a little bit from where you started.

Bill

2 volts, that's sweet. make one of these, http://www.instructables.com/id/Leyden_jar_of_DOOM/
let it charge and tap off it when you need. i'm kidding about the leyden jar of doom of course but the 2v is sweet.